Stochastic backgrounds of gravitational waves from extragalactic sources

TL;DR

This paper reviews theoretical predictions of gravitational wave backgrounds from extragalactic sources, emphasizing their spectral features and potential detectability with current and future observatories.

Contribution

It provides a comprehensive overview of the different astrophysical components contributing to the gravitational wave background and discusses their observational prospects.

Findings

Multiple astrophysical processes contribute to the gravitational wave background.

Spectral properties vary across different extragalactic sources.

Detection prospects depend on the sensitivity of future observatories.

Abstract

Astrophysical sources emit gravitational waves in a large variety of processes occurred since the beginning of star and galaxy formation. These waves permeate our high redshift Universe, and form a background which is the result of the superposition of different components, each associated to a specific astrophysical process. Each component has different spectral properties and features that it is important to investigate in view of a possible, future detection. In this contribution, we will review recent theoretical predictions for backgrounds produced by extragalactic sources and discuss their detectability with current and future gravitational wave observatories.